diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-20 12:03:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-20 12:03:55 -0800 |
| commit | ea5aac6fae94bff4756051b0503f86e31ef6808b (patch) | |
| tree | 7ceab90282b60a359e27808bcad8c1bebdb34ecc /include | |
| parent | 05e6295f7b5e05f09e369a3eb2882ec5b40fff20 (diff) | |
| parent | 47d586913f2abec4d240bae33417f537fda987ec (diff) | |
Merge tag 'fs.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping
Pull vfs hardening update from Christian Brauner:
"Jan pointed out that during shutdown both filp_close() and super block
destruction will use basic printk logging when bugs are detected. This
causes issues in a few scenarios:
- Tools like syzkaller cannot figure out that the logged message
indicates a bug.
- Users that explicitly opt in to have the kernel bug on data
corruption by selecting CONFIG_BUG_ON_DATA_CORRUPTION should see
the kernel crash when they did actually select that option.
- When there are busy inodes after the superblock is shut down later
access to such a busy inodes walks through freed memory. It would
be better to cleanly crash instead.
All of this can be addressed by using the already existing
CHECK_DATA_CORRUPTION() macro in these places when kernel bugs are
detected. Its logging improvement is useful for all users.
Otherwise this only has a meaningful behavioral effect when users do
select CONFIG_BUG_ON_DATA_CORRUPTION which means this is backward
compatible for regular users"
* tag 'fs.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping:
fs: Use CHECK_DATA_CORRUPTION() when kernel bugs are detected
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/poison.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/poison.h b/include/linux/poison.h index 2d3249eb0e62..0e8a1f2ceb2f 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -84,4 +84,7 @@ /********** kernel/bpf/ **********/ #define BPF_PTR_POISON ((void *)(0xeB9FUL + POISON_POINTER_DELTA)) +/********** VFS **********/ +#define VFS_PTR_POISON ((void *)(0xF5 + POISON_POINTER_DELTA)) + #endif |